"Many companies have the technology--and customers' permission, thanks to the privacy policies that users accept routinely without reading--to track minute details of people's movements," The Washington Post reports, "but have held off from revealing how much they know with marketing offers that might come off as invasive." Digital coupons contain information about where they were obtained and redeemed and even the search terms used to find them, the report states. That data can then be matched with consumer information found both online and offline, including users' age, sex, income, purchases and Web browsing history, which has advocates asking users to consider whether the deals offered are worth potentially compromising their privacy. (Registration may be required to access this story.)
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